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Hints
NamedNativeQuery and NamedQuery of JPA used to create the HQL and Native SQL queries with the Entity.
@NamedNativeQuery gets three type of parameter. such as name, query and resultClass. name is to read the query from the entity using createNamedQuery and query parameter contains the query of HQL and Native SQL. resultClass used to specify casting type of the entity class.
@NamedQuery has two parameters, such as name and query. NamedQuery used to specify HQL queries with the query parameter.
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package com.knowledgewalls.entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedNativeQuery;
import javax.persistence.NamedQuery;
@Entity(name="STUDENT_INFO")
@NamedQuery(name="StudentInfo.byName",query="from STUDENT_INFO where StudentName = ?")
@NamedNativeQuery(name="StudentInfo.byId",query="SELECT * FROM STUDENT_INFO WHERE STUDENT_ID = ?",resultClass=StudentInfo.class)
public class StudentInfo {
@Id @GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="STUDENT_ID")
private int studentId;
@Column(name="STUDENT_NAME")
private String StudentName;
public StudentInfo(){}
public StudentInfo(int studentId,String StudentName){
this.studentId = studentId;
this.StudentName = StudentName;
}
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
public String getStudentName() {
return StudentName;
}
public void setStudentName(String studentName) {
StudentName = studentName;
}
} |
package com.knowledgewalls.dao;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import com.knowledgewalls.entity.StudentInfo;
@Repository
@Transactional
public class StudentInfoDAO {
@PersistenceContext
EntityManager em;
public void save10Students(){
try {
for (int i=1;i<=10;i++){
StudentInfo studentInfo = new StudentInfo();
studentInfo.setStudentName("Student "+i);
em.persist(studentInfo);
}
}
catch(Exception e){
System.out.println("Insertion Failure.");
e.printStackTrace();
}
}
public StudentInfo getStudentByName(String studentName){
try {
/*
* For security reasons append the data with query is not suggest to use
* Here they can append like > (5 or 1 = 1) to get all records from a table
*
*/
Query query = em.createNamedQuery("StudentInfo.byName");
query.setParameter(1, studentName);
return (StudentInfo) query.getSingleResult();
}
catch (Exception e){
e.printStackTrace();
return null;
}
}
public StudentInfo getStudentById(int studentId){
try {
Query query = em.createNamedQuery("StudentInfo.byId");
query.setParameter(1, studentId);
return (StudentInfo) query.getSingleResult();
}
catch (Exception e){
e.printStackTrace();
return null;
}
}
} |
StudentInfoController.java package com.knowledgewalls.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import com.google.gson.Gson;
import com.knowledgewalls.dao.StudentInfoDAO;
@Controller
public class StudentInfoController {
@Autowired
StudentInfoDAO studentInfoDAO;
private void displayObject(Object object) {
if (object == null)
System.out.println("Null");
else
System.out.println(new Gson().toJson(object));
}
@RequestMapping(value="/doRun",method=RequestMethod.GET)
public @ResponseBody String addUsers(){
{
studentInfoDAO.save10Students();
displayObject(studentInfoDAO.getStudentById(4));
displayObject(studentInfoDAO.getStudentByName("Student 7"));
}
return "Saved and Retrieved by HQL";
}
} |
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd" >
<persistence-unit name="hibernatePersistenceUnit">
<properties>
<property name="hibernate.hbm2ddl.auto" value="create" />
</properties>
</persistence-unit>
</persistence> |
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd">
<context:component-scan base-package="com.knowledgewalls" />
<mvc:annotation-driven />
<tx:annotation-driven transaction-manager="transactionManager" />
<bean id="emf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceXmlLocation" value="classpath*:persistence.xml" />
<property name="persistenceUnitName" value="hibernatePersistenceUnit" />
<property name="dataSource" ref="dataSource"/>
<property name="jpaVendorAdapter" ref="jpaVendorAdapter"/>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="mysql" />
<property name="initialSize" value="5" />
<property name="maxActive" value="10" />
</bean>
<bean id="jpaVendorAdapter" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="database" value="MYSQL"></property>
<property name="showSql" value="true"></property>
<property name="generateDdl" value="false"></property>
<property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect"></property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="emf" />
</bean>
<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor"/>
<bean class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor"/>
</beans> |
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Hibernate023_NamedQueriesNNamedNativeQueries</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>beans</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>beans</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app> |
drop table if exists STUDENT_INFO;
create table STUDENT_INFO
(STUDENT_ID integer not null auto_increment,
STUDENT_NAME varchar(255),
primary key (STUDENT_ID)) ENGINE=InnoDB; |
